"Grubps !" Creation of a game on iPhone/iPod Touch.

I'm a young french developer (15 years old) and I create a game on iPhone/iPod touch. His name is "Grubps !" , it's an arcade game and it's free ^^
So , say me what do you think about it , and give me your opinion in order I can improve my game Thank you

PS : I'm french so speak english isn't easy for me ^^ But I try to speak english without mistakes (THANKS GOOGLE xD) ^^